#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  background-color: #f5f5f5;
  overflow: hidden;
  display: flex;
  padding: 20px;
  flex: 1;
}
body {
  margin: 0;
  height: 100vh;
  display: flex;
}